MIC2045 Micrel Semiconductor, MIC2045 Datasheet
MIC2045
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MIC2045 Summary of contents
Page 1
... Additionally, for tighter control over inrush current during start up, the output slew-rate may be adjusted by an external capacitor. The MIC2045 features a auto-reset circuit breaker that latches the output OFF upon detecting an overcurrent condition lasting more than 32ms. The output is reset by removing or reducing the load. ...
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... Active-High X Active-Low X PWRGD 1 16 VIN PGREF /FAULT 3 14 VOUT SLEW 4 13 VIN UVLOIN 5 12 VOUT ILIM 6 11 VIN VIN 7 10 GND VBIAS 8 9 VOUT MIC2044/MIC2045 16-Pin TSSOP (TS) 2 Micrel Package 16-Pin TSSOP 16-Pin TSSOP 16-Pin TSSOP 16-Pin TSSOP October 2003 ...
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MIC2044/2045 Pin Description Pin Number www.DataSheet4U.com 6 5 7,11,13,16 9,12, October 2003 Pin Name Pin Function PWRGD Power-Good (Output): Open drain N-Channel device, active high. This pin asserts high when the voltage at ...
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... IN BIAS I = 500mA OUT Output off V = 3V, 5V, 0. OUT OUT 1.6V to 5.5V IN BIAS V = 0. rising (MIC2045) OUT Output latched off (MIC2045) I (/FAULT) = 15mA OL I (PWRGD) = 5mA FAULT PWRGD V rising IN V falling IN V rising IN V falling IN T increasing J ...
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... OUT I OUT /FAULT October 2003 Condition 3V BIAS LOAD LOAD LOAD LOAD > 4.0V for MIC2044/MIC2045 – CLF/R . LIM SET 50 10% 0 OUT (a) MIC2044/45-1 50 10% 0 OUT (b) MIC2044/45-2 Figure 1. Turn-On/Turn-Off Delay ...
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MIC2044/2045 Test Circuit www.DataSheet4U.com *R MIC2044/2045 C1 0 MIC2044/45-xBTS 0 VBIAS R1 20k 7, 11, 13, 16 VIN 20k R3 3 /FAULT 75k 5 UVLOIN R4 ...
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MIC2044/2045 Typical Characteristics Supply Current vs. Temperature 300 275 5.5V 250 IN BIAS 225 BIAS 200 175 150 1.6V 125 IN BIAS 100 -40 -20 0 ...
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... LOAD R = 220 SET 5.0V IN BIAS R = 1.2 LOAD LOAD R = 100 SET 8 Micrel 5V Turn-Off Latched Output Reset MIC2045 4.82V 5.0V IN BIAS R toggles from 2 to OPEN LOAD LOAD R = 220 SET TIME (50ms/div.) UVLO Response 1.45V V ramps LOAD LOAD ...
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MIC2044/2045 Functional Characteristics (continued) Output Slew Response www.DataSheet4U.com TIME (2.5ms/div.) October 2003 LOAD LOAD C = 0.033 F SLEW R = 220 SET 9 Thermal Shutdown Response V = ...
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... SLEW Input 2 EN Logic MIC2044/45 MIC2044/2045 V = 230mV REF Bandgap Reference Thermal Shutdown + Gate UVLO Control + Charge Pump Power-On Latch Reset (MIC2045) OSC 10 8 VBIAS 7,11,13,16 Power-Off VIN Reset 9,12,14 VOUT Replica Amp + Current Limit I 6 ILIM LIM + Delay (32ms) Open Load Detect ...
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... MIC2044/2045 Functional Description The MIC2044 and MIC2045 are high-side N-Channel switches equipped with programmable current limit for use in general purpose power distribution applications. The switches, available with active-high or active-low enable inputs, provide output slew-rate control and circuit protection via thermal shutdown and an optional output latch during overcurrent conditions ...
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... MOSFET being shut off. Circuit Breaker Function (MIC2045) The MIC2045 is designed to shut off all power to the load when a fault condition occurs, just as a circuit breaker would do. In this case, a fault condition is deemed to be anytime the output current exceeds the current limit for more than the flag delay period, nominally 32ms ...
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... VOUT) differential voltage and concludes a fault condition is present if the differential voltage exceeds 200mV for more than the flag delay period. For the MIC2045, the /FAULT will assert and the output will latch off if the output is not within 200mV of the input before the flag delay times out. ...
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... This same feature also can be used for soft-start requirements. PCB Layout Recommendations The MIC2044 and MIC2045 have very low on-resistance, typically 20m , and the switches can provide continuous output current. Under heavy loads, the switched current may cause the devices to heat up considerably ...
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MIC2044/2045 Package Information www.DataSheet4U.com MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel ...